Feng Deyi (568–627), formal name Feng Lun but goes by the courtesy name of Deyi, formally initially Duke Ming of Mi, later Duke Miao of Mi, is an official of the Chinese dynasty Sui Dynasty and Tang Dynasty who serves as a chancellor during the reigns of Emperor Gaozu of Tang and Emperor Taizong of Tang.

He is praised for his quick thinking but criticized by historians for his being overly attentive to the emperors' desires.